Don't know about inverts. But if you use the proper amounts of ferts or CO2 the fish will be fine. Use too much of either and the fish are goners. I will say that I used to think that if the CO2 was high, that meant the oxygen level was low. But that's not necessarily true. Water can hold high amounts of each at the same time.
IMHO, pressurized CO2 is the only way to go. DIY setups are very difficult to keep stabel levels in the water and you have to continuously monitor and recharge the bottles, gets very messy. There are people who do it successfully so it can be done, but once a pressurized system is setup and dialed in, maintenance is minimal.
the only advantage with the DIY way (my way lol) is that its cheap and VERY inexpensive. Buying your own co2 system can be very pricey with its well worth it
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